Help pls

Why Are Some Actions Not Sustainable

*based on human geography*

Given sin=-4/5 and x is in quadrant 3, what is the value of tan x/2

Which of the following statements is not true about regions? a.) regions have fixed boundaries that are determined by the region's inhabitants.b.) a region can be defined by physical characteristics, such as climate, landform, and vegetation.c.) regions can change over time.d.) a region can be defined by human characteristics, such as language, government, and economic activity.e.) the same location can be considered part of multiple regions.

Can someone answer this question without telling me to try my best if i don’t finish my flvs work will i not be able to move to the next grade